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# File activesupport/lib/active_support/json/encoding.rb, line 215def as_json(options=nil)#:nodoc:# use encoder as a proxy to call as_json on all elements, to protect from circular referencesencoder=options&&options[:encoder]||ActiveSupport::JSON::Encoding::Encoder.new(options)map{|v|encoder.as_json(v)}end